 Fri Jul 25 21:48:15 2008, Doug Preddy, Quench Recovery, another quench
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System was stable and solenoid ramped up at 4:00 today. At about 7:30 it tripped off again. I came in and restarted the compressor and am now cooling in
parallel cold return mode. Solenoid is at ~30K. I talked to Kevin and he will get the power leads on tomorrow morning. Once they are stable the power supply
can be ramped up.
I phoned Curtis, but there was no answer (he may be on holidays??) |
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Sat Jul 26 01:06:04 2008, Doug Preddy, Quench Recovery, Refrigerator in series mode
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| Switched to series mode. Solenoid ~8K, starting to build liquid. |
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Sat Jul 26 01:29:21 2008, Doug Preddy, Quench Recovery, power leads
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ops will monitor liquid level. When it's at 60% they will come down and open the power lead valve. When the temperature ripples die out the solenoid can
be energized. |
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Sat Aug 23 17:02:38 2008, Doug Preddy, Quench Recovery, Solenoid quenched
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The solenoid quenched this afternoon at ~12:30. The compressor shut down. Fault lights were cold box trip.
Restarted the compressor by 3:30 and started
flow to the solenoid by 4:15.
Peter Yandon came down with Ops' radio to investigate the radios may trip the solenoid. When the radio is keyed the vacuum
guages jump. CG1, CG5 and the pirani gauges. This would trip of the refrigerator. More investigation to happen tomorrow and on maintenance day. |
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Sun Aug 24 06:45:14 2008, Doug Preddy, Quench Recovery, switch to series mode
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Fri Sep 26 09:45:18 2008, Doug Preddy, Quench Recovery, Solenoid quenched at 7:50
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| Compressor on. Turbines started. Vacuum system recovering. |
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Fri Sep 26 09:50:18 2008, Doug Preddy, Quench Recovery, started flow in parallel cold return mode
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Sun Oct 5 18:54:27 2008, Doug Preddy, Quench Recovery, Solenoid Quench ~16:30
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| Restarted compressor and flow to coldbox by 18:30 |
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Wed May 27 08:06:00 2009, Doug Preddy, Quench Recovery, Solenoid quenched at 5:00
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The solenoid quenched at 5:00 this morning due to power lead temps. The temps started oscillating about 10 minutes before the trip. The compressor and
the cold box stayed on. The flow to the solenoid was stopped.
The solenoid flow was started in parallel cold return at ~7:20. |
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Wed May 27 13:37:22 2009, Doug Preddy, Quench Recovery, switch to series mode
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| Switched to series mode at ~11:00. Built liquid to 55% by 13:30. Started flow to the power leads. |
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Wed May 27 15:01:34 2009, Doug Preddy, Quench Recovery, power leads
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| Power leads are cold. There is still a small ripple. The power supply can be ramped up as soon as the ripples die out. |
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Fri Jul 10 00:34:03 2009, Doug Preddy, Quench Recovery, solewnoid quench due to power bump
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Solenoid quench due to power bump caused by an airplane crash in Richmond at ~ 22:00. Compressor off. Water pump off. Restarted compressor at ~ 11:30.
Cooling solenoid in parallel cold return mode by 12:15. |
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Fri Jul 10 01:10:59 2009, Doug Preddy, Quench Recovery, switch to parallel warm return
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Tue Jul 14 15:28:36 2009, Doug Preddy, Quench Recovery, Solenoid ramped up
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The solenoid is cold and I have started to ramp up the power supply. Some slight ripples in the power leads, but they are dieing out. Liquid level is
a lot more stable this time. |
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Fri Apr 9 07:34:55 2010, Doug Preddy, Quench Recovery, switched to parallel cold return
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Switched to parallel cold return at about 7:30 this morning
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Mon May 3 07:49:54 2010, Doug Preddy, Quench Recovery, Solenoid quench Saturday
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Solenoid quenched at ~13:30 Saturday. Kevin came in later in the day to recover it. System was in all around mode, no flow to solenoid. Discharge pressure
went over 12 bar while starting flow and tripped the compresswor. After restart solenoid was cooling well.
Monday morning 7:30 I opened CV155 to increase the cooldown rate. |
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Thu May 13 07:39:55 2010, Doug Preddy, Quench Recovery, solenoid quench last night
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| Solenoid quenched on power lead temps last evening. I am recovering it in parallel cold return mode. C12~60K C1~50K. |
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Thu May 13 14:37:13 2010, Doug Preddy, Quench Recovery, switching to series mode.
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Mon Jun 7 09:24:47 2010, Doug Preddy, Quench Recovery, started flow to power leads
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Thu Jun 9 06:53:40 2005, Experimentor, Other, Trip at 6:45 Today.
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Solenoid quenched at 6:45. All temperature monitors were flat until trip.
Hearing compressor stop was first warning. Lights are:
Turbine T1 overspeed, Compresor alarm, cryostat quench.
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